Composition and process for lubricated plastic working of metals

Abstract

A lubricant composition for the plastic working of metals that does not require a phosphate undercoating, is waterborne, requires only a simple application process of immersion or spraying followed by drying, and provides an excellent lubricating performance comprises synthetic resin, water-soluble inorganic salt, and water. The weight ratio of the content of salt to that of synthetic resin is from 0.25:1 to 9: 1. This composition can also contain liquid and / or solid lubricating agent(s) and an extreme pressure additive.

Description

FIELD AND BACKGROUND OF THE INVENTIONThis invention relates to a highly effective composition for use in the plastic working of metals, for example, iron, steel, titanium, and aluminum. More particularly, this invention relates to a composition of the aforementioned type that forms a strongly-lubricating coating by a simple process in which, before a workpiece is to be subjected to plastic working, the composition is coated on the workpiece by spray or immersion and then dried. The invention also relates to processes for lubricated plastic working of metal, utilizing a lubricant composition according to the invention.A solid or fluid lubricant is generally used during the plastic working of metals in order to reduce the friction generated by metal to metal contact between the tool and workpiece and thereby prevent seizure and scarring. Lubricated processes for plastic working of metals can be broadly classified into two categories based on the method of use of the lubricant. Into on...

AI Technical Summary

Problems solved by technology

Phosphate treatments, however, are known to have a number of problems.

Thus, phosphate treatments, because they are based on chemical reactions, have required a complex bath management.

Phosphate treatments have also been associated with high plant and equipment costs and high operating costs due to the discharge of large amounts of effluent from the conversion coating and the water rinses used during the treatment and due to the necessity for heating in order to optimize the chemical reactions.

However, even though this is a high-performance lubricant, it nevertheless exhibits working characteristics that are somewhat inferior to those of lubricants produced by treatment with a reactive soap after a phosphate conversion coating treatment.

Another drawback of this high-performance lubricant is the unpleasant odor produced during plastic working operations that use it.

However, this lubricant has to date not achieved widespread use as a substitute for conversion treatments.

This example notwithstanding, dry-method water-based lubricants equivalent to conversion treatments have not been obtained.

Images